:root {
    --bg: #ffffff;
    --bg-secondary: #f5f5f5;
    --fg: #1a1a1a;
    --fg-secondary: #666666;
    --border: #dddddd;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --success: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;
    --radius: 6px;
    --font-mono: "SF Mono", "Cascadia Code", "Fira Code", Consolas, monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #1a1a1a;
        --bg-secondary: #2a2a2a;
        --fg: #e5e5e5;
        --fg-secondary: #999999;
        --border: #444444;
        --accent: #3b82f6;
        --accent-hover: #60a5fa;
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--fg);
    line-height: 1.6;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem;
}

header {
    margin-bottom: 1.5rem;
    position: relative;
}

.github-corner svg {
    fill: var(--accent);
    color: var(--bg);
    position: fixed;
    top: 0;
    right: 0;
    border: 0;
    z-index: 10;
}

.github-corner:hover .octo-arm {
    animation: octocat-wave 560ms ease-in-out;
}

@keyframes octocat-wave {
    0%, 100% { transform: rotate(0); }
    20%, 60% { transform: rotate(-25deg); }
    40%, 80% { transform: rotate(10deg); }
}

header h1 {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 600;
}

header p {
    color: var(--fg-secondary);
    font-size: 0.875rem;
}

.explainer {
    margin-bottom: 1rem;
    font-size: 0.875rem;
    color: var(--fg-secondary);
    line-height: 1.7;
}

.explainer details {
    margin-top: 0.5rem;
}

.explainer summary {
    cursor: pointer;
    color: var(--accent);
    font-size: 0.8125rem;
}

.explainer summary:hover {
    text-decoration: underline;
}

.explainer ul {
    margin-top: 0.5rem;
    padding-left: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    font-size: 0.8125rem;
}

.drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background-color 0.2s;
}

.drop-zone:hover,
.drop-zone:focus-visible {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 5%, transparent);
}

.drop-zone.dragging {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 10%, transparent);
    border-style: solid;
}

.drop-zone-content svg {
    color: var(--fg-secondary);
    margin-bottom: 0.75rem;
}

.drop-zone-content p {
    margin: 0.25rem 0;
}

.hint {
    color: var(--fg-secondary);
    font-size: 0.8125rem;
}

.options-section {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.option-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.option-row label {
    font-size: 0.875rem;
    white-space: nowrap;
    min-width: 200px;
}

.option-row input {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--fg);
    font-size: 0.875rem;
    font-family: var(--font-mono);
}

.option-row input:focus {
    outline: 2px solid var(--accent);
    outline-offset: -1px;
}

.status-bar {
    margin-top: 1rem;
    padding: 0.5rem 0.75rem;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    font-size: 0.875rem;
    color: var(--fg-secondary);
}

.status-bar.processing {
    color: var(--accent);
}

#results-section {
    margin-top: 1.5rem;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.results-header h2 {
    font-size: 1.125rem;
}

.results-actions {
    display: flex;
    gap: 0.5rem;
}

.btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.875rem;
    cursor: pointer;
    transition: background-color 0.15s, border-color 0.15s;
    font-family: var(--font-sans);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
}

.btn-secondary {
    background: var(--bg);
    color: var(--fg);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-secondary);
}

.summary {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.summary-item {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.summary-count {
    font-weight: 600;
    font-family: var(--font-mono);
}

.filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
}

.filter-label {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.8125rem;
    color: var(--fg-secondary);
    cursor: pointer;
    user-select: none;
}

.filter-label input[type="checkbox"] {
    accent-color: var(--accent);
    cursor: pointer;
}

.summary-hidden {
    color: var(--fg-secondary);
    font-weight: 400;
    font-size: 0.8125rem;
}

.table-container {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
}

th, td {
    padding: 0.5rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    background: var(--bg-secondary);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.025em;
    color: var(--fg-secondary);
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background: color-mix(in srgb, var(--accent) 3%, transparent);
}

.col-select {
    width: 2rem;
    text-align: center;
}

.col-select input[type="checkbox"] {
    accent-color: var(--accent);
    cursor: pointer;
}

.ski {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.badge {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    border-radius: 999px;
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.badge-leaf { background: color-mix(in srgb, var(--accent) 15%, transparent); color: var(--accent); }
.badge-intermediate { background: color-mix(in srgb, var(--warning) 15%, transparent); color: var(--warning); }
.badge-root { background: color-mix(in srgb, var(--fg-secondary) 15%, transparent); color: var(--fg-secondary); }
.badge-match { background: color-mix(in srgb, var(--success) 15%, transparent); color: var(--success); }
.badge-no-match { background: color-mix(in srgb, var(--fg-secondary) 10%, transparent); color: var(--fg-secondary); }
.badge-expired { background: color-mix(in srgb, var(--danger) 15%, transparent); color: var(--danger); }

#keys-section {
    margin-top: 1.5rem;
}

#keys-section h3,
#warnings-section h3 {
    font-size: 0.9375rem;
    margin-bottom: 0.75rem;
}

#warnings-section {
    margin-top: 1.5rem;
}

#warnings-list {
    list-style: none;
    padding: 0;
}

#warnings-list li {
    padding: 0.375rem 0.75rem;
    margin-bottom: 0.25rem;
    background: color-mix(in srgb, var(--warning) 10%, transparent);
    border-left: 3px solid var(--warning);
    border-radius: 0 var(--radius) var(--radius) 0;
    font-size: 0.8125rem;
}

footer {
    margin-top: 3rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--fg-secondary);
    font-size: 0.75rem;
}

footer a {
    color: var(--fg-secondary);
    text-decoration: underline;
}

footer a:hover {
    color: var(--accent);
}

@media (max-width: 640px) {
    body {
        padding: 1rem;
    }

    .option-row {
        flex-direction: column;
        align-items: stretch;
    }

    .option-row label {
        min-width: unset;
    }

    .results-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .summary {
        flex-wrap: wrap;
        gap: 0.75rem;
    }
}